#399

backend/app/services/post_thumbnail_upload_validator.rb

@@ -16,7 +16,7 @@ class PostThumbnailUploadValidator
 
     attachment = Post.resized_thumbnail_attachment(thumbnail, content_type: thumbnail.content_type)
     attachment[:io].close if attachment[:io].respond_to?(:close)
-  rescue MiniMagick::Error
+  rescue MiniMagick::Error, Timeout::Error
     raise InvalidUpload, 'サムネイル画像の変換に失敗しました．'
   ensure
     thumbnail&.rewind if thumbnail.respond_to?(:rewind)